Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosures to Consolidated Statements of Cash Flows - Cash flow changes, reconciliation of components of cash (Details)

v3.20.4
Supplemental Disclosures to Consolidated Statements of Cash Flows - Cash flow changes, reconciliation of components of cash (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Disclosures to Consolidated Statements of Cash Flows        
Cash and cash equivalents $ 2,831 $ 1,222 $ 358  
Restricted cash included in other current assets 16 57 70  
Restricted cash included in other assets 30 27 24  
Total cash and cash equivalents and restricted cash at end of period $ 2,877 $ 1,306 $ 452 $ 1,047